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Anti-corrosive coating compound

a coating compound and anti-corrosion technology, applied in the direction of coatings, cosmetic preparations, toilet preparations, etc., can solve the problems of reducing the service life of immersion baths, affecting the stability of immersion baths, and no longer being possible in the futur

Active Publication Date: 2016-02-04
EWALD DORKEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a coating compound that can be used without causing problems in the service life of the compound used for the immersion bath.

Problems solved by technology

While the coating compounds often offer good corrosion protection after hardening on a workpiece, their stability during use is often problematic since some of the aforementioned components react with the liquid of the coating compound or with the workpieces to be coated.
Due to the insertion and extraction of workpieces from an immersion bath, impurities can also be introduced so that undesirable secondary reactions, which reduce the service life of the immersion bath, can occur during the coating.
Without a stabilizer, which prevents these undesirable secondary reactions, the service life of a coating compound is often just a few hours.
Due to toxicological concerns with respect to boron compounds and legal requirements, this will no longer be possible in the future.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

exemplary embodiment 1

[0040]For an anti-corrosive coating compound according to the invention, first the component I, the metal particles, and the component II, the binder, are produced:

Component I:

[0041]Metal particles, here zinc particles, are ground as a paste with 10 weight-% white spirit. Aluminum particles, ground with a high-boiling alcohol (boiling point above 100° C.) such as e.g. dipropylene glycol, magnesium particles, tin particles, mixtures or alloys of the aforementioned metals can also be used as metal particles.

Component II

[0042]An epoxy silane oligomer, here a bifunctional organosilane, glycidyloxypropyltriethoxy siloxane, is provided water-free with a solid content of 100 weight-%.

[0043]The other individual components described in greater detail below are also produced separately. Transport components are then produced from the individual components or elements of the coating compound. It is advantageous if the weight units of the transport components are coordinated so that respectivel...

exemplary embodiment 2

[0051]Eight experiments are explained here, which were performed with various salts of the acids of transition metals, in order to show the improvement of the stability of coating compounds. If nothing else is mentioned, the compound and production correspond with the coating compound in exemplary embodiment 1.

[0052]As shown in Table 1, the component I (the metal particles), here pastes made of zinc flakes and zinc aluminum alloy flakes, and the component II (the binder), here an epoxy silane oligomer, in the presence of organic solvents (dipropylene glycol and 1-nitropropane) are mixed to form a transport component A. Metal particles and binder do not react with each other in a disadvantageous manner even in the case of longer storage periods and can be mixed in connection with the further components or elements described below to form a stable immersion bath or a stable preparation e.g. for the spraying of workpieces.

[0053]Further components like defoamers and agents for adjusting...

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Abstract

An anti-corrosive coating compound with: component I: cathodically active metal particles and component II: binder in the presence of water. In order to improve the service life of the coating compound, it is provided that an oxygen compound or a mixture of oxygen compounds of the subgroup elements, namely ammonium, alkaline or earth alkaline salts of an acid of a transition metal, is added as component III. The invention further relates to a method for producing an anti-corrosive coating compound, a workpiece coated with the anti-corrosive coating compound and the use of an oxygen compound or a mixture of oxygen compounds of the subgroup elements in an anti-corrosive coating compound.

Description

BACKGROUND OF THE INVENTION[0001]The invention relates to an anti-corrosive coating compound with metal particles, a method for producing this coating compound and a workpiece coated with this coating compound.[0002]Coating compounds, which act in an anti-corrosive manner and which contain metal particles, are generally known, e.g. from WO 2005 / 090 502. They primarily contain metal particles for the cathodic corrosion protection, for the most part zinc and / or aluminum particles or zinc alloy particles as well as binders in the presence of water and / or solvents. The binders are often based on silicon-containing compounds; typical binders are inorganic mono-, oligo- or polymers such as silicates, silanes or silanols, but also siloxanes. Depending on the intended use, also organic binders, if applicable also as co-polymers of the inorganic binders, are suitable.[0003]While the coating compounds often offer good corrosion protection after hardening on a workpiece, their stability during...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D5/08C08K5/41C09D105/00C09D183/06
CPCC09D5/08C08K5/41C09D183/06C09D105/00C09D5/10C09D5/103C09D5/106
Inventor BATTAGLIA, CAROLINABOEHM, SANDRAGROSSMANN, VERENAREUSMANN, GERHARDROTH, MARCELWALTER, SUSANNE
Owner EWALD DORKEN